Abstract
ABSTRACTA versatile dispersant plays a critical role in suspension stability of pesticide aqueous suspension concentrate (SC), thus it is extremely important to design and synthesize an effective dispersant for SC. Herein, nonionic trimeric nonylphenol polyoxyethylene (10) (TNP10) was successfully synthesized using nonylphenol polyoxyethylene(10) ethers (NP10) as raw materials. The surface activities of TNP10 were evaluated according to critical micelle concentration (CMC), and the surface tension at CMC (γCMC). TNP10 showed higher surface activity due to its lower CMC value compared with that of NP10. In addition, the dispersing and stabilizing properties of TNP10 in 25 wt.% pyraclostrobin SC system were investigated. The results showed that TNP10 as a dispersant exhibited more excellent dispersion performance than NP10. Meanwhile, the obtained SC system exhibits shear thinning behavior under high-speed shearing showing typical features of pseudo-plastic non-Newtonian fluids, which conforms to the Herschel-Buckley model. The nonionic trimeric nonylphenol polyoxyethylene (10 can effectively improve the surface activities and the suspension rate and stability of SC compared with its monomer NP10.
Highlights
Trimeric surfactants, which have three hydrophobic groups, three hydrophilic groups, and a rigid or flexible spacer in the molecule, have been synthesized in a great variety of chemical structures for different applications [1,2,3]
In the process of pesticide particles dispersing into aqueous solution, the pesticide particles were firstly wet by aqueous solutions, and by increasing the wettability of the pesticide surfaces, dispersants reduce the frequently observed tendency of hydrophobic pesticide particles to spontaneously aggregate in aqueous suspensions, the lower surface tension of the aqueous solution is, the easier the wetting of pesticide particles so as to help the pesticide particles more readily disperse into aqueous solution [38]
The surface activity properties experimental results show that the CMC value of TNP10 is lower than that of the corresponding monomeric Nonylphenol polyoxyethylene(10) ethers (NP10)
Summary
Trimeric surfactants, which have three hydrophobic groups, three hydrophilic groups, and a rigid or flexible spacer in the molecule, have been synthesized in a great variety of chemical structures for different applications [1,2,3]. They exhibited much lower CMC, Kraftt point and better solubility in water than dimeric and monomeric surfactants [3,4,5]. We further explore the SC stability mechanism using TNP10 as dispersant
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